https://repository.kopri.re.kr/handle/201206/5066 2026-04-18T13:48:16Z 2026-04-18T13:48:16Z Kim, Jeong-Hoon https://repository.kopri.re.kr/handle/201206/8848 2022-03-24T07:13:00Z 2015-12-15T00:00:00Z

Title: 남극 세종기지주변 인간활동으로 인한 환경변화 모니터링 Authors: Kim, Jeong-Hoon

2015-12-15T00:00:00Z Sora Seo Park, Sangjong Park, Keyhong Rhee, Tae Siek https://repository.kopri.re.kr/handle/201206/7149 2022-03-24T07:10:23Z 2015-01-01T00:00:00Z

Title: TEMPORAL VARIATION OF TROPOSPHERIC OZONE AND SPRINGTIME OZONE DEPLETION EVENTS AT KING SEJONG STATION, ANTARCTICA Authors: Sora Seo; Park, Sangjong; Park, Keyhong; Rhee, Tae Siek Abstract: Tropospheric ozone concentration and meteorological factors were measured from 2009 to 2013 at King Sejong station (KSG) located at the tip of the Antarctic peninsula, King George Island. The trend estimation of ozone for each month did not show any significant increasing or decreasing trends during the study period. However, tropospheric ozone concentration showed seasonal variation of 14~34 ppbv with high and low concentration in winter and summer, respectively. Ozone depletion events (ODEs), which are natural phenomena that background ozone rapidly drops near zero level, were frequently found during the austral spring from August to November. The monthly mean depleted ozone concentration due to ODEs was 0.7~2.1 ppbv, which can affect the polar chemical processes, radiation budgets, and further climate. In addition to the seasonal variation, diurnal variation of ozone derived from the solar radiation was found with the range of 0.4~0.8 ppbv, although this change is small compared to other non-polar regions due to low NOx concentration. For simple calculation of tropospheric ozone budget in high latitude region of Southern Hemisphere based on ozone data at KSG, a conceptual box model was developed. This model showed that the net loss term including photochemical destruction and deposition is balanced with the net gain term of stratospheric entrainment. Also, we found that ODEs at KSG are significantly related with not only specific meteorological conditions including lower temperature, higher wind speed, and easterly wind but also air masses advected from the Weddell Sea covered by the extended sea-ice through the backward trajectory analysis.

2015-01-01T00:00:00Z Rhee, Tae Siek Sora Seo Park, Keyhong https://repository.kopri.re.kr/handle/201206/7148 2022-03-24T07:10:21Z 2015-01-01T00:00:00Z

Title: Temporal variation of total gaseous mercury around the Korean Antarctic Station, King Sejong, in King George Island Authors: Rhee, Tae Siek; Sora Seo; Park, Keyhong Abstract: Total gaseous mercury (TGM) is primarily composed of the elemental mercury (Hg0) vapor along with a trace amount of reactive gaseous mercury (RGM) and particle bounded mercury (PBM). The Hg0 vapor may even, in particular in the remote areas, be >99% of the total gaseous mercury in air where the particulate mercury is significantly lower. The concentrations of TGM were monitored in the ambient air of the Korean Antarctic research station, King Sejong (62˚13'S 58˚47'W) from March 2009 to August 2011 at an time-resolution of one hour using an automated analyzer with the atomic absorption spectroscopic technique. Maximum concentration of 9.1 ng/m3 has been detected due likely to the pollution from the station. The mean value of TGM during the whole period of observation is 0.8(±0.5) ng/m3 which is within the range of mean values obtained in the Antarctic Stations. TGM shows seasonal variation of high concentration in summer and low concentration in late winter. Lower TGM level has already been reported in the past studies, in particular in the Antarctic early spring, due primarily to the so called phenomenon "mercury depletion events (MDE)" during the polar sunrise mainly governed by the BrO radicals. Low TGM reported during the polar spring perhaps because oxidation of the Hg0 vapor producing highly reactive and soluble oxidized mercury species followed by absorption on the surface of the atmospheric aerosols and eventual deposition to the ecosystem. Additional analysis on backward trajectories to find origin of the air masses for MDE will be useful.

2015-01-01T00:00:00Z